Thanks for all the help guys, I ended up going for a very basic Pioneer unit, has a screen, does bluetooth, would support a camera if needed..
..Now, the previous owner had a Parrot in the car, and as such already made some 'modifications' to the wiring, Obviously the stuff thats connected with the red sleeves is for the parrot, so would I be able to close them off, or do they serve a purpose anywhere else?
..Power is another thing that looks to be re-routed, i think that's the red cable with the fuse - Would anyone know if i can bypass the connector and attach to the red wire from the headunit?